"We're about to do the bit ... and he goes, 'Hey, make sure you hit that harmony.' I go, 'Oh, yeah, no problem.' And he grabbed my wrist and he goes, 'Hey, I'm serious, man. Make sure you hit that harmony.' And I got scared. I felt like Lance Bass. I go, 'Hey, dude, we're dressed as the Bee Gees. Have fun.'" Fallon said.

"We're about to do the bit ... and he goes, 'Hey, make sure you hit that harmony.' I go, 'Oh, yeah, no problem.' And he grabbed my wrist and he goes, 'Hey, I'm serious, man. Make sure you hit that harmony.' And I got scared. I felt like Lance Bass. I go, 'Hey, dude, we're dressed as the Bee Gees. Have fun.'" Fallon said.